extensionSystem: Fix deferred loading of extensions

We need to show the list of installed extensions on EGO, so we can't defer
loading by not creating the extension meta.

https://bugzilla.gnome.org/show_bug.cgi?id=662704

js/ui/lookingGlass.js

@@ -737,6 +737,7 @@ Extensions.prototype = {
             case ExtensionSystem.ExtensionState.ENABLED:
                 return _("Enabled");
             case ExtensionSystem.ExtensionState.DISABLED:
+            case ExtensionSystem.ExtensionState.INITIALIZED:
                 return _("Disabled");
             case ExtensionSystem.ExtensionState.ERROR:
                 return _("Error");